Paul from SWISCO responded:
September 10, 2019
If your balance bottom nylon shoe depth is 1", then you can go with the S380-24. If it is 1-3/32", then go with the S385-24. Take a look at the diagram below showing how to properly measure the depth of the bottom balance shoe. Whichever one chosen will go with a 2320 option. Alternate view of 15-004
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